Libcurl Security Vulnerabilities

CVE-2023-27535

An authentication bypass vulnerability exists in libcurl <8.0.0 in the FTP connection reuse feature that can result in wrong credentials being used during subsequent transfers. Previously created connections are kept in a connection pool for reuse if they match the current setup. However, certai...

CVE-2023-27536

An authentication bypass vulnerability exists libcurl <8.0.0 in the connection reuse feature which can reuse previously established connections with incorrect user permissions due to a failure to check for changes in the CURLOPT_GSSAPI_DELEGATION option. This vulnerability affects krb5/kerberos/...

CVE-2023-27537

A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate "handles". This sharing was introduced without considerations for do this sharing across separate threads but there was no indication of this fact in the documentation. Due to missing mutexes or thread l...

CVE-2023-27538

An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent ...

CVE-2023-38545

This flaw makes curl overflow a heap based buffer in the SOCKS5 proxyhandshake. When curl is asked to pass along the host name to the SOCKS5 proxy to allowthat to resolve the address instead of it getting done by curl itself, themaximum length that host name can be is 255 bytes. If the host name is...

CVE-2023-38546

This flaw allows an attacker to insert cookies at will into a running programusing libcurl, if the specific series of conditions are met. libcurl performs transfers. In its API, an application creates "easy handles"that are the individual handles for single transfers. libcurl provides a function ca...

CVE-2024-32928

The libcurl CURLOPT_SSL_VERIFYPEER option was disabled on a subset of requests made by Nest production devices which enabled a potential man-in-the-middle attack on requests to Google cloud services by any host the traffic was routed through.

CVE-2024-6197

libcurl's ASN1 parser has this utf8asn1str() function used for parsing an ASN.1 UTF-8 string. Itcan detect an invalid field and return error. Unfortunately, when doing so it also invokes free() on a 4 byte localstack buffer. Most modern malloc implementations detect this error and immediately abort...

CVE-2024-6874

libcurl's URL API functioncurl_url_get() offers punycodeconversions, to and from IDN. Asking to convert a name that is exactly 256bytes, libcurl ends up reading outside of a stack based buffer when built touse the macidn IDN backend. The conversion function then fills up theprovided buffer exactly ...

CVE-2024-7264

libcurl's ASN1 parser code has the GTime2str() function, used for parsing anASN.1 Generalized Time field. If given an syntactically incorrect field, theparser might end up using -1 for the length of the time fraction , leading toa strlen() getting performed on a pointer to a heap buffer area that i...